You will really like the Blackberry. There are so many things about it that will help you enjoy. Stay tuned and read all you can in this forum as it contains a wealth of information.
I remember many years ago when I got my 6510 Blackberry from Nextel. It seemed I would never learn to use it. You simply need to learn as you need to understand a new funtion. I was lucky and has a friend who had used Blackberry for several years. People here will help, too.
One thing to note if you are getting your 8820 through Orange UK: Orange have disabled Blackberry Maps! Orange wants you to use their own service which you have to pay for. You can get BB Maps working by following John Clark's notes here: